We have a windows 2003 standard R2 Sp2 32 bit server with Citrix Xenapp 4.5 License server
This server was also the secondary domain controller.

I did a successful Dcpromo to remove DC - worked fine , but after reboot I cannot connect citrix from any clients ?? Citrix 4.5 is on a seperate server but we had the xml config running on the DC I just DCpromoed.

Is our problem related to licensing server or your users just can not connect to PS?You are saying 'we had xml config" - I presume that you mean WebInterface. If licensing is OK (should be if you did not change hostname) check citrix plugin. If you use FQDN (servername.domain.com), change it only to 'myserver'.

first check licensing - maybe it's still running OK. If your Presentation Server shows no error, than it's OK. You can install licensing on any other server. But than you'll need to get new xenapp license from mycitrix.com (you can reallocate your existing licenses).

Web access can be installed on any other server too. you must install 'services' for internal access and 'web site' for external access.

How to install and configure Citrix XenApp 6.5 - Part 1. In this video tutorial we have explained step by step installation of Citrix XenApp 6.5 Server on Windows Server 2008 R2 is explained in this video.
We have explained the difference between…

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